Where I live, R12 is ILLEGAL to use! Never mind that refrigerators and home air conditioners use the stuff....but I'm off topic. When repaired, that is, all components are leak-free and working properly, the system will be recharged with some environmentally-friendly substance like 134A instead. Do you know what that canister thing's function is? Some sort of damper? That's what I'll be heating up, but is there anything inside it, except refridgerant?

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1986 560SL
2002 Toyota Camry
1993 Lexus